Highly Stable 6-18 GHz 2.3 dB Low-Noise Amplifier with Resistive-Loaded Series Feedback Circuits

Hidenori YUKAWA  Yukinobu TARUI  Koh KANAYA  Hiromitsu UCHIDA  Masatoshi NAKAYAMA  Yasushi ITOH  

IEICE TRANSACTIONS on Electronics   Vol.E86-C    No.12    pp.2445-2451
Publication Date: 2003/12/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Recent Trends on Microwave and Millimeter Wave Application Technology)
Category: Amplifier
microwave,  amplifier,  wideband,  low-noise,  GaAs,  

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A novel design method for wideband low-noise multi-stage amplifiers is presented. It utilizes a RL-SFC (esistive oaded eries eedback ircuit) comprised of a series feedback circuit with additional lossy match stubs to achieve low noise figure, low VSWRs, flat gain, and high stability simultaneously. In addition, each stage amplifier employs a different approach for designing the RL-SFC to achieve the best compromise between noise figure, VSWR, gain, and stability as a multi-stage amplifier. With the use of this novel design method, the 3-stage amplifier has demonstrated the state-of-the-art wideband low-noise performance of 2.3 dB over 6 to 18 GHz.